Highly toluene sensing performance based on monodispersed Cr2O3 porous microspheres

Ma, Hua; Xu, Yingming; Rong, Zimei; Cheng, Xiaoli; Gao, Shan; Zhang, Xianfa; Zhao, Hui; Huo, Li‐Hua

doi:10.1016/j.snb.2012.08.073

Cited by 105 publications

(65 citation statements)

References 36 publications

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“…It is revealed from these reports that efficient sensor response towards BTX (or individuals) was achieved at the expense of high operating temperature (≥ 250°C) [4][5][6][7][8][9][10]. However, relatively low temperature (~25-200°C) BTX sensing has also been reported by some research groups [11][12][13][14][15]. Among these reports, cobalt oxide nanocubes found to offer high response magnitude towards BTX at 200°C [11].…”

Section: Introductionmentioning

confidence: 99%

“…several metal oxide (Co 3 O 4 , WO 3 , ZnO, Cr 2 O 3 , SnO 2 , TiO 2 etc.) based gas/vapor sensors have been investigated so far to sense the BTX family as a whole or its individual constituents (B, T or X) [4][5][6][7][8][9][10][11][12][13][14][15]. It is revealed from these reports that efficient sensor response towards BTX (or individuals) was achieved at the expense of high operating temperature (≥ 250°C) [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Among these reports, cobalt oxide nanocubes found to offer high response magnitude towards BTX at 200°C [11]. By increasing the surface roughness of Cr 2 O 3 microspheres (with ~40 nm particles on surface), high response can be achieved (~5800% to 200 ppm toluene at 170°C), but at the cost of slow recovery (~7 min) [12]. Cao et al [13] reported on ZnO nanoparticle-nanorod based xylene sensor at 150°C with appreciably high response with faster response/recovery profile.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

Dutta

Chattopadhyay

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

Dutta

Chattopadhyay

et al. 2015

Applied Surface Science

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“…Already established methods for toluene detection are mostly based on optical methods such as surface plasmon resonance [16] and cataluminescence [17]. Various chemoresistive metal oxide gas sensors have been used to detect toluene, which include monodispersed Cr 2 O 3 porous microspheres [18], SnO 2 nanofibers [19], SnO 2 − Fe 2 O 3 interconnected nanotubes [20] and SmFeO 3 [21]. However, metal oxide chemoresistive gas sensors have some well-known disadvantages, e.g.…”

Section: Introductionmentioning

confidence: 99%

Toluene vapor sensing characteristics of novel copper(II), indium(III), mono-lutetium(III) and tin(IV) phthalocyanines substituted with 2,6-dimethoxyphenoxy bioactive moieties

Pişkin

Can

Odabaş

et al. 2018

J. Porphyrins Phthalocyanines

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This study presents the synthesis, characterization and toluene sensing properties of copper(II), indium(III) acetate, mono-lutetium(III) acetate and tin(IV) phthalocyanines substituted with 2,6-dimethoxyphenol bioactive groups at the peripheral and non-peripheral positions. The effects of the substituent's position on the toluene vapor detection capabilities of these compounds were investigated. Adsorption data were analyzed by using first-order and Elovich equations in order to investigate the adsorption kinetics. It was found that the kinetics of the toluene adsorption strongly depends on the position of the substituent groups. Our results showed that the Elovich equation fits the experimental data well for non-peripherally substituted Pc based sensors, while the pseudo first-order model best describes the adsorption data for peripheral substituted Pc based sensors. Some physical, photophysical and photochemical of 2,6-dimethoxyphenoxy substituted metal-free and metallophthalocyanines (indium(III) and zinc(II) Pcs) were investigated by our group [26]. We wondered how copper(II), indium(III), mono-lutetium(III) and tin(IV) Pcs substituted with 2,6-dimethoxyphenoxy bioactive moieties affect the physical, electronic and toluene sensing properties. Hence, highly soluble peripherally and non-peripherally substituted Cu(II), In(III), Lu(III) and Sn(IV) Pcs with 2,6-dimethoxyphenoxy were also synthesized (Scheme 1), and the effects of the position of the substituents and the variety of central metal ions on the their spectroscopic and toluene vapors sensing properties were investigated in this study. KEYWORDS EXPERIMENTAL Materials and Equipment2,6-Dimethoxy-phenoxy substituted phthalonitriles (1 and 2) were obtained by the reaction of 2,6-dimethoxy phenol with 3-nitrophthalonitrile or 4-nitrophthalonitrile through base catalyzed nucleophilic aromatic displacement reaction [26]. All other starting materials and solvents used were obtained commercially. All reactions were carried out under dry nitrogen atmosphere. The novel Pcs (3-10) were successively cleaned by washing with hot acetic acid-water solution by volume 7/3, water, ethanol and acetonitrile in the Soxhlet apparatus. Column chromatography was performed on silica gel 60 for a proper purification of the raw compounds. The purity of the products was tested in each step by thin layer chromotography (Silicagel F-254 coated TLC plate). Melting points of the Pc compounds were found to be higher than 300 °C. IR Spectra and electronic spectra were recorded on a Shimadzu FTIR-8300 (ATR) and a Shimadzu UV-1601 spectrophotometer, respectively. Elemental analyses were performed by the Instrumental Analysis Laboratory of TUBITAK-Ankara. Mass spectra were acquired on a Microflex III MALDI-TOF mass spectrometer (Bruker Daltonics, Germany) equipped with a nitrogen UV-Laser operating at 337 nm in reflectron mode with an average of 50 shots. SynthesisGeneral procedure for the synthesis of metallophth alocyanines (3-10).

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“…Particularly, porous hollow microspheres assembled by nanoparticles, nanorods, nanosheets, or complex nanocrystallites, have received increasing attention for their novel architectures may enable functional materials with optimized properties. Chromium oxides (Cr 2 O 3 ), as a wide band gap (E g ¼3.4 eV) p-type semiconductor with magnetic properties, which have potential applications in catalysis [5], lithium ion batteries [6], magnetic elements [7] and sensors [8], have been extensively investigated. Up to now, various distinct structures of Cr 2 O 3 have been synthesized, such as hollow hexagonal pellets [5], nanowires [9] and ordered mesoporous structures [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of porous Cr2O3 hollow microspheres via a facile template-free approach

Sun¹,

Wang²,

Chu³

et al. 2015

Materials Letters

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Highly toluene sensing performance based on monodispersed Cr2O3 porous microspheres

Cited by 105 publications

References 36 publications

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

A highly sensitive BTX sensor based on electrochemically derived wall connected TiO2 nanotubes

Toluene vapor sensing characteristics of novel copper(II), indium(III), mono-lutetium(III) and tin(IV) phthalocyanines substituted with 2,6-dimethoxyphenoxy bioactive moieties

Synthesis of porous Cr2O3 hollow microspheres via a facile template-free approach

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